1 files changed, 31 insertions, 0 deletions
diff --git a/includes/functions_user.php b/includes/functions_user.php
new file mode 100644
index 0000000..690350a
--- /dev/null
+++ b/includes/functions_user.php
@@ -0,0 +1,31 @@
+<?php
+
+function username_exists(string $username): bool
+{
+	$sql = "SELECT * FROM users WHERE user_name = ?;";
+	$result = Database::get()->query($sql, "s", $username);
+
+	return !empty($result);
+}
+
+function register_user(string $username, string $pass_hash)
+{
+	$sql = "INSERT INTO users(user_name, user_pass, user_date, user_level) VALUES(?, ?, NOW(), 0);";
+	Database::get()->query($sql, "ss", $username, $pass_hash);
+}
+
+function change_password(User $user, string $pass_hash)
+{
+	if (!Session::get()->is_signed_in()) {
+		trigger_error('You are not signed in.');
+		return;
+	}
+
+	if (Session::get()->get_current_user()->id != $user->id) {
+		trigger_error("You can't change another user's password.");
+		return;
+	}
+
+	$sql = "UPDATE users SET user_pass = ? WHERE user_id = ?;";
+	Database::get()->query($sql, "si", $pass_hash, $user->id);
+}
+\ No newline at end of file